层状岩体的破坏特征及其迭代计算方法研究

层状岩体沿层面和层面法向方向的物理力学特性各异，为明显的各向异性，其破坏形式和破坏机理与一般岩体也不同。根据层状岩体的物理力学性质分析了其破坏特性及其迭代计算方法，推导了损伤状态应力表达式和损伤刚度修正表达式。采用三维非线性弹塑性损伤有限元数值计算方法，通过工程实例分析了岩层倾角对洞室围岩稳定的影响。通过对各种岩层倾角方案的计算和比较，结合工程经验，得出层状岩体中地下洞室的合理布置方式。分析结果与工程实际相吻合，本文的研究为层状岩体中的工程设计提供了比较可靠的理论基础和有益参考。

Study on Failure Characteristics and Computational Method of Layered Rock

The physical and mechanical characteristics of layered rock are different between its tangential and normal orientations. So it is anisotropic and its failure mode and mechanism are different from isotropic rock. The failure characteristics and the calculation method of layered rock were expounded according to its physical and mechanical characteristics. The computational formulas of stress and stiffness in rock mass damage state were calculated. Then impact of rock angle was analyzed for underground houses using 3D nonlinear elastic-plastic finite element method in an example. According to computation and comparison to the example with many programs and engineering experiences, the reasonable layout of underground houses in layered rock was put forward. The result is in accordance with engineering experiences, which provides a reliable theory basis and some technical references for engineering design in layered rock.